Week 5, Day 1: Two Hundred Sit-Ups

Here we go: I'm on Week 5 of The Two Hundred Sit-Ups Challenge.  I modified my crunch just a little - now I hold my legs at a 90° angle to my torso.  I have read that this gives my upper abs and lower abs a better workout.  And, I could feel it about half way through set 1.  Er, um, 255 crunches in about 10 minutes is pretty good to me!